Motorcycle Drag Race in Hungary - Aug, 2013! Who's Going With Me?

[Mark Olson]

if your fj has anti -dive forks you are more like a 87 ,so it would be 41 teeth.

[racerman_27410]

Mark is correct.... stock with the anti dive 1200s was 17/41


KOokaloo!

[andyb]

17/40 should be right on a 3CV.  Also was the best gearing that I used at the track with mine, though that was with the YZF wheel; equal to 17/41 on stock tires.

[Lotsokids]

Thanks. I was looking at Randy's RPM parts website and it seems my only options are 39, 40, and 42 teeth. I wonder if I should just go with a 42, but keeping in mind the nearly 6-hour ride to the track.

http://www.rpmracingca.com/proddetail.asp?prod=RearSprocket

[andyb]

The 40 was decidedly faster for me than a 42 (41 vs 43 if you correct for the tire).  If you're not replacing the chain, go with the 40, which will give you more wheelbase and make it easier to launch hard. 

[movenon]

Scroll down to Performance Spec's. I don't know how accurate the info is but it seems reasonable.

http://wiki.gfm.net:443/FJ1200_Specs

[Lotsokids]

I ordered a 41-tooth rear sprocket from Ebay.

[Mark Olson]

I hope you ordered the steel one and not aluminum.  the fj turns those to cheese.

[Lotsokids]

I hope you ordered the steel one and not aluminum.  the fj turns those to cheese.

Yes, it's steel. Good to know, though!

[fj1289]

I got enough miles out of a aluminum rear sprocket to go through a good set of Dunlops -- but that also included just over 100 drag strip runs. Used aluminum since it was the only thing readily available for the PM Chicane rims.